Waste gas waste heat recovery hot water vapor multi-output system

Abstract

The utility model discloses a waste gas waste heat recovery hot water vapor multi-output system which comprises a waste gas path, and a filter, a first heat exchanger, a second heat exchanger and a waste gas high-voltage electrostatic purification device are sequentially arranged in the waste gas path in the waste gas circulation direction. The high-temperature circulating water loop communicates with the first heat exchanger, and the high-temperature circulating water loop can discharge high-temperature steam and boiling water after the first heat exchanger conducts heat exchange on the waste gas; and the tap water path communicates with the second heat exchanger, and the tap water path can discharge medium-temperature hot water after the second heat exchanger conducts heat exchange on the waste gas. According to the utility model, stepped waste heat recovery is carried out on waste gas, so that the recovery efficiency of waste heat of the waste gas can be effectively improved, and the effect of simultaneously preparing medium-temperature hot water, boiling water and high-temperature steam is realized, so that different heat use temperature requirements of the process are met, the effects of saving energy, reducing consumption and saving operation investment are realized, and the energy consumption in the printing and dyeing process is reduced.

Description

Technical Field

[0001] This utility model relates to the field of waste gas treatment, specifically a waste gas waste heat recovery hot water and steam multi-output system. Background Technology

[0002] The printing and dyeing industry involves multiple processes, such as dyeing, printing, and finishing. Different processes require different heating temperatures. For example, the dyeing process requires adding dye at 40℃ to 60℃, followed by stepwise temperature increases. The finishing process requires drying the fabric at temperatures above 150℃. Currently, the printing and dyeing industry mainly uses high-temperature and high-pressure steam for heating and drying. This requires raising the water temperature to different levels to meet the temperature requirements of different processes. At the same time, the waste gas generated during the printing and dyeing process also needs to be cooled. Existing technology uses water cooling to cool the waste gas. However, the cooled water cannot be recycled due to its increased temperature, thus becoming wastewater that needs to be continuously discharged, resulting in high energy consumption in the printing and dyeing process. Utility Model Content

[0003] In order to overcome the defects in the prior art, this utility model provides a waste heat recovery hot water and steam multi-output system for solving one or more of the above-mentioned problems.

[0004] This application discloses an embodiment of a waste gas waste heat recovery hot water and steam multi-output system, comprising: a waste gas path, wherein a filter, a first heat exchanger, a second heat exchanger, and a high-voltage electrostatic purification device for waste gas are sequentially arranged along the waste gas flow direction; a high-temperature circulating water circuit, wherein the high-temperature circulating water circuit is connected to the first heat exchanger, and the high-temperature circulating water circuit can discharge high-temperature steam and boiling water after exchanging heat with the waste gas in the first heat exchanger; and a tap water path, wherein the tap water path is connected to the second heat exchanger, and the tap water path can discharge medium-temperature hot water after exchanging heat with the waste gas in the second heat exchanger.

[0005] Furthermore, the high-temperature circulating water circuit includes a first shut-off valve and a second shut-off valve located on both sides of the first heat exchanger.

[0006] Furthermore, the high-temperature circulating water circuit includes a high-temperature heat pump water heater and a first hot water pump, the first hot water pump being used to circulate hot water between the high-temperature heat pump water heater and the first heat exchanger.

[0007] Furthermore, the high-temperature circulating water circuit also includes a high-temperature outlet water pipe and a return water pipe respectively connected to the high-temperature heat pump water heater unit. The return water pipe is connected to the flash tank. The end of the high-temperature outlet water pipe away from the high-temperature heat pump water heater unit has a first branch and a second branch. The first branch is used to discharge boiling water, and the second branch is connected to the flash tank and used to pass boiling water to the flash tank. The flash tank is connected to a high-temperature steam output pipe.

[0008] Furthermore, a steam compressor is installed in the high-temperature steam output pipeline.

[0009] Furthermore, the water supply circuit includes a tap water inlet pipe and a medium-temperature hot water outlet pipe that are respectively connected to both ends of the second heat exchanger.

[0010] Furthermore, the tap water circuit also includes a three-way regulating valve located in the medium-temperature hot water outlet pipe. The inlet of the three-way regulating valve is connected to the front end of the medium-temperature hot water outlet pipe, one outlet of the three-way regulating valve is connected to the rear end of the medium-temperature hot water outlet pipe, and the other outlet of the three-way regulating valve is connected to the tap water softening device.

[0011] Furthermore, the tap water softening device is also connected to the return water pipe, and the return water pipe is equipped with a second hot water pump.

[0012] The beneficial effects of this utility model are as follows:

[0013] 1. By performing step-by-step waste heat recovery on waste gas, the recovery efficiency of waste heat can be effectively improved, and the effects of simultaneously preparing medium-temperature hot water, boiling water and high-temperature steam can be achieved, thereby meeting the different heat temperature requirements of the process, thus achieving the effects of energy saving, consumption reduction and saving operating investment, and reducing energy consumption in the dyeing and printing process.

[0014] 2. By closing the first shut-off valve and the second shut-off valve, the first heat exchanger can be easily disassembled, thereby facilitating the cleaning and regular maintenance of the first heat exchanger.

[0015] 3. The opening of the three-way regulating valve can be adjusted according to the amount of boiling water and high-temperature steam used to meet the system's water replenishment requirements. The tap water softening device can prevent scale from forming in the high-temperature heat pump water heater unit after tap water is added, thereby improving the heat exchange performance of the high-temperature heat pump water heater unit.

[0016] To make the above and other objects, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a waste gas waste heat recovery hot water and steam multi-output system according to an embodiment of this utility model;

[0019] The reference numerals in the above attached figures are as follows: 1. Exhaust gas path; 11. Filter; 12. First heat exchanger; 13. Second heat exchanger; 14. High-voltage electrostatic purification device for exhaust gas; 2. High-temperature circulating water circuit; 21. First shut-off valve; 22. Second shut-off valve; 23. High-temperature heat pump water heater unit; 24. First hot water pump; 25. High-temperature outlet water pipe; 251. First branch; 252. Second branch; 26. Return water pipe; 27. Flash tank; 28. High-temperature steam output pipe; 29. ​​Steam compressor; 210. Second hot water pump; 3. Tap water path; 31. Tap water inlet pipe; 32. Medium-temperature hot water outlet pipe; 33. Three-way regulating valve; 34. Tap water softening device. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] like Figure 1 As shown in this embodiment, a waste heat recovery system for hot water and steam multi-output includes:

[0022] The exhaust gas path 1 includes, in sequence along the exhaust gas flow direction, a filter 11, a first heat exchanger 12, a second heat exchanger 13, and a high-voltage electrostatic purification device 14. The filter 11 filters the high-temperature exhaust gas in the exhaust gas path 1, thereby removing impurities. The first heat exchanger 12 can be a water-cooled mechanism, using water to cool the high-temperature exhaust gas, thus lowering its temperature. Simultaneously, the water temperature in the first heat exchanger 12 rises, raising its temperature to a high level, achieving a gas-water heat exchange effect at high temperature. Similarly, the second heat exchanger 13 can also be a water-cooled mechanism, using water to cool the medium-temperature exhaust gas, thus lowering its temperature. Simultaneously, the water temperature in the second heat exchanger 13 rises, raising its temperature to a medium level, achieving a gas-water heat exchange effect at a medium temperature. Since the high-voltage electrostatic purifier 14 for exhaust gas needs to operate below 60°C, it is positioned after the first heat exchanger 12 and the second heat exchanger 13 to effectively ensure the operating temperature of the high-voltage electrostatic purifier 14 for exhaust gas.

[0023] A high-temperature circulating water circuit 2 is connected to the first heat exchanger 12, allowing water for cooling to be introduced into the first heat exchanger 12. The high-temperature circulating water circuit 2 can discharge high-temperature steam and boiling water after exchanging heat with the exhaust gas in the first heat exchanger 12, thereby enabling the water in the first heat exchanger 12 to exchange heat with the high-temperature exhaust gas. The temperature of the high-temperature steam can reach 150°C, thus meeting the high-temperature drying requirements of the shaping and finishing process. The boiling water is hot water at 100°C.

[0024] Water supply line 3 is connected to the second heat exchanger 13, so that water for cooling can be introduced into the second heat exchanger 13. Water supply line 3 can discharge medium-temperature hot water after exchanging heat with the exhaust gas in the second heat exchanger 13. In this embodiment, the medium-temperature hot water is warm water of 40℃~60℃, so as to meet the temperature requirements for dyeing process.

[0025] In this embodiment, high-temperature exhaust gas is introduced into exhaust gas path 1. The high-temperature exhaust gas is first pre-filtered by primary filter 11, then cooled by first heat exchanger 12. During this process, the high-temperature exhaust gas is reduced to a medium temperature, and the water temperature in the first heat exchanger 12 is increased. This heated water is then heated through high-temperature circulating water loop 2, and high-temperature steam and boiling water are discharged. The high-temperature boiling water serves as 100°C hot water for the process, while the high-temperature steam is used for high-temperature drying in the shaping and finishing process. The medium-temperature exhaust gas then passes through second heat exchanger 13 for cooling. During this process, the medium-temperature exhaust gas is reduced to below 60°C, and the tap water in the second heat exchanger 13 is raised to 40°C–60°C to become warm water. This warm water is discharged as medium-temperature hot water for the process. Finally, the exhaust gas, cooled to below 60°C, is purified by high-voltage electrostatic purification device 14, thereby achieving both cooling and purification of the exhaust gas, and transferring the heat from the exhaust gas to the cooling water for utilization.

[0026] By utilizing the above structure and performing step-by-step waste heat recovery on the exhaust gas, the waste heat recovery efficiency can be effectively improved, enabling the simultaneous preparation of medium-temperature hot water, boiling water, and high-temperature steam. This satisfies the different heat temperature requirements of the process, thereby achieving energy saving, consumption reduction, and reduced operating investment, and lowering energy consumption in the dyeing and printing process.

[0027] Specifically, the high-temperature circulating water circuit 2 includes a first shut-off valve 21 and a second shut-off valve 22 located on both sides of the first heat exchanger 12. This allows the first heat exchanger 12 to be easily disassembled by closing the first shut-off valve 21 and the second shut-off valve 22 after long-term operation, when pollutants in the exhaust gas form scale on the surface of the first heat exchanger 12. This facilitates cleaning and regular maintenance of the first heat exchanger 12.

[0028] Specifically, the high-temperature circulating water circuit 2 includes a high-temperature heat pump water heater unit 23 and a first hot water pump 24. The first hot water pump 24 is used to circulate hot water between the high-temperature heat pump water heater unit 23 and the first heat exchanger 12. The high-temperature heat pump water heater unit 23 is used to further heat up the water in the high-temperature circulating water circuit 2 after heat exchange with high-temperature waste gas, improve the heat quality, and produce boiling water, i.e., hot water at 100°C.

[0029] Specifically, the high-temperature circulating water circuit 2 further includes a high-temperature outlet water pipe 25 and a return water pipe 26, which are respectively connected to the high-temperature heat pump water heater unit 23. The return water pipe 26 is connected to the flash tank 27. The end of the high-temperature outlet water pipe 25 away from the high-temperature heat pump water heater unit 23 has a first branch 251 and a second branch 252. The first branch 251 is used to discharge boiling water, and the second branch 252 is connected to the flash tank 27 and is used to pass boiling water to the flash tank 27. The flash tank 27 is connected to a high-temperature steam output pipe 28. Preferably, a steam compressor 29 is provided in the high-temperature steam output pipe 28 to generate high-temperature steam. This allows the boiling water generated by the high-temperature heat pump water heater unit 23 to be discharged through the first branch 251, and the remaining hot water is returned to the high-temperature circulating water circuit 2 by the return water pipe 26, thereby ensuring that the water volume in the high-temperature circulating water circuit 2 remains stable and achieving the effect of generating boiling water and high-temperature steam.

[0030] Specifically, the water supply line 3 includes a tap water inlet pipe 31 and a medium-temperature hot water outlet pipe 32, which are respectively connected to both ends of the second heat exchanger 13. Thus, room-temperature tap water is introduced into the second heat exchanger 13 through the tap water inlet pipe 31, and medium-temperature hot water is obtained through heat exchange between the medium-temperature exhaust gas and the second heat exchanger 13, and then discharged through the medium-temperature hot water outlet pipe 32.

[0031] Specifically, the tap water circuit 3 also includes a three-way regulating valve 33 located in the medium-temperature hot water outlet pipe 32. The inlet of the three-way regulating valve 33 is connected to the front end of the medium-temperature hot water outlet pipe 32, one outlet of the three-way regulating valve 33 is connected to the rear end of the medium-temperature hot water outlet pipe 32, and the other outlet of the three-way regulating valve 33 is connected to the tap water softening device 34. Preferably, the tap water softening device 34 is also connected to the return water pipe 26, and the return water pipe 26 is equipped with a second hot water pump 210. The second hot water pump 210 is used to circulate the water in the return water pipe 26 to the high-temperature heat pump water heater unit 23, so that the opening of the three-way regulating valve 33 can be adjusted according to the amount of boiling water and high-temperature steam used to meet the system's water replenishment needs. The tap water softening device 34 can prevent scale formation in the high-temperature heat pump water heater unit 23 after tap water replenishment, thereby improving the heat exchange performance of the high-temperature heat pump water heater unit 23.

[0032] This utility model uses specific embodiments to illustrate the principle and implementation of the utility model. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​the utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​the utility model. Therefore, the content of this specification should not be construed as a limitation of the utility model.

Claims

1. A waste gas waste heat recovery hot water and steam multi-output system, characterized in that, include: The exhaust gas path includes a filter, a first heat exchanger, a second heat exchanger, and an exhaust gas high-voltage electrostatic purification device arranged sequentially along the exhaust gas flow direction. A high-temperature circulating water circuit is connected to the first heat exchanger. The high-temperature circulating water circuit can discharge high-temperature steam and boiling water after exchanging heat with the exhaust gas in the first heat exchanger. The tap water circuit is connected to the second heat exchanger, and the tap water circuit can discharge medium-temperature hot water after exchanging heat with the exhaust gas in the second heat exchanger.

2. The waste heat recovery hot water and steam multi-output system according to claim 1, characterized in that, The high-temperature circulating water circuit includes a first shut-off valve and a second shut-off valve located on both sides of the first heat exchanger.

3. The waste heat recovery hot water and steam multi-output system according to claim 1, characterized in that, The high-temperature circulating water circuit includes a high-temperature heat pump water heater and a first hot water pump, which is used to circulate hot water between the high-temperature heat pump water heater and the first heat exchanger.

4. The waste heat recovery hot water and steam multi-output system according to claim 3, characterized in that, The high-temperature circulating water circuit also includes a high-temperature outlet water pipe and a return water pipe that are respectively connected to the high-temperature heat pump water heater unit. The return water pipe is connected to the flash tank. The end of the high-temperature outlet water pipe away from the high-temperature heat pump water heater unit has a first branch and a second branch. The first branch is used to discharge boiling water, and the second branch is connected to the flash tank and used to pass boiling water to the flash tank. The flash tank is connected to a high-temperature steam output pipe.

5. A waste gas waste heat recovery hot water and steam multi-output system according to claim 4, characterized in that, A steam compressor is installed in the high-temperature steam output pipeline.

6. The waste heat recovery hot water and steam multi-output system according to claim 4, characterized in that, The water supply circuit includes a tap water inlet pipe and a medium-temperature hot water outlet pipe, which are respectively connected to both ends of the second heat exchanger.

7. A waste gas waste heat recovery hot water and steam multi-output system according to claim 6, characterized in that, The tap water circuit also includes a three-way regulating valve located in the medium-temperature hot water outlet pipe. The inlet of the three-way regulating valve is connected to the front end of the medium-temperature hot water outlet pipe, one outlet of the three-way regulating valve is connected to the rear end of the medium-temperature hot water outlet pipe, and the other outlet of the three-way regulating valve is connected to the tap water softening device.

8. A waste gas waste heat recovery hot water and steam multi-output system according to claim 7, characterized in that, The tap water softening device is also connected to the return water pipe, and the return water pipe is equipped with a second hot water pump.

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